Changing the build system to CMake

[1ay1]

Right now the plugin only works on *nix.
On windows the plugin is building but doesn't show up in the Pidgin.

Windows support is underway.

[EionRobb]

That's a shame to lose the commit history of the original plugin. Is it not possible to import all the original commits from the hg repo to keep the history?

[dequis]

As I mentioned in #516, the branch called "libpurple-integration" (i didn't pick the name) has that

[1ay1]

It's going to to very complicated to do that, and I don't know hg too well either.
Let's make a new start by paying homage to the original authors everywhere in the code.

"libpurple-integration" could have the commit history because the directory structure is not changed in that branch.
Here I changed the directory structure too and made it a bit simple so that new people can dive into code and help us fix bugs.

"libpurple-integration" branch is solving nothing.

[EionRobb]

I appreciate the work you've done here, but losing the history is a deal-breaker. Keeping the history of changes (to understand the "why") is pretty important for a protocol plugin to understand what makes it tick and what changes can be made without breaking things.

If you want to rebase against the libpurple-integration branch and attach the CMake scripts to that then we can review that PR, but right now this PR is solving nothing

[1ay1]

That's ok, I'm going to continue my work on my fork then.